KR910002654B1 - 정자계 동질화 방법 - Google Patents

정자계 동질화 방법 Download PDF

Info

Publication number
KR910002654B1
KR910002654B1 KR1019860008389A KR860008389A KR910002654B1 KR 910002654 B1 KR910002654 B1 KR 910002654B1 KR 1019860008389 A KR1019860008389 A KR 1019860008389A KR 860008389 A KR860008389 A KR 860008389A KR 910002654 B1 KR910002654 B1 KR 910002654B1
Authority
KR
South Korea
Prior art keywords
magnetic field
shimmering
volume
legendr
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
KR1019860008389A
Other languages
English (en)
Korean (ko)
Other versions
KR870004302A (ko
Inventor
오 돈넬 매튜
죠지 카르 스티븐
다니엘 바버 윌리암
민 왕 지쉬
앨런 에델스타인 윌리암
Original Assignee
제너럴 일렉트릭 캄파니
샘슨 헬프고트
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 제너럴 일렉트릭 캄파니, 샘슨 헬프고트 filed Critical 제너럴 일렉트릭 캄파니
Publication of KR870004302A publication Critical patent/KR870004302A/ko
Application granted granted Critical
Publication of KR910002654B1 publication Critical patent/KR910002654B1/ko
Expired legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/387—Compensation of inhomogeneities
    • G01R33/3875—Compensation of inhomogeneities using correction coil assemblies, e.g. active shimming
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
KR1019860008389A 1985-10-07 1986-10-07 정자계 동질화 방법 Expired KR910002654B1 (ko)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US06/785,140 1985-10-07
US06/785,140 US4680551A (en) 1985-10-07 1985-10-07 Method for homogenizing a static magnetic field over an arbitrary volume
US785,140 1985-10-07

Publications (2)

Publication Number Publication Date
KR870004302A KR870004302A (ko) 1987-05-08
KR910002654B1 true KR910002654B1 (ko) 1991-04-27

Family

ID=25134570

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019860008389A Expired KR910002654B1 (ko) 1985-10-07 1986-10-07 정자계 동질화 방법

Country Status (6)

Country Link
US (1) US4680551A (enExample)
EP (1) EP0219013A3 (enExample)
JP (1) JPS62123705A (enExample)
KR (1) KR910002654B1 (enExample)
CA (1) CA1288806C (enExample)
IL (1) IL80135A0 (enExample)

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879516A (en) * 1985-08-14 1989-11-07 Picker International, Inc. Precision electrical adjustment of quadrature coil isolation
FR2598808B1 (fr) * 1986-05-13 1993-09-17 Thomson Cgr Procede de reglage des correcteurs d'homogeneite du champ magnetique cree par un aimant
GB8619012D0 (en) * 1986-08-04 1986-09-17 Picker Int Ltd Electromagnet arrangements
DE3628161A1 (de) * 1986-08-20 1988-02-25 Spectrospin Ag Vorrichtung zum kompensieren von zeitvarianten feldstoerungen in magnetfeldern
US4761614A (en) * 1987-04-27 1988-08-02 Phospho-Energetics, Inc. Device and method for automatic shimming of NMR instrument
GB2207762B (en) * 1987-06-23 1992-01-02 Mitsubishi Electric Corp Magnetic field compensating apparatus
US5121060A (en) * 1987-11-05 1992-06-09 University Of Queensland Magnetic field homogenization in NMR spectroscopy
US4950994A (en) * 1988-03-07 1990-08-21 General Electric Company Gradient and polarizing field compensation
US4812797A (en) * 1988-03-22 1989-03-14 General Electric Company Compensation coil for temporal drift of a superconducting magnet
US4820985A (en) * 1988-04-06 1989-04-11 General Electric Company Apparatus for tuning an NMR field coil
US4899109A (en) 1988-08-17 1990-02-06 Diasonics Inc. Method and apparatus for automated magnetic field shimming in magnetic resonance spectroscopic imaging
US5023554A (en) * 1989-05-22 1991-06-11 The Reagents Of The University Of California Fringe field MRI
US5006804A (en) * 1989-12-04 1991-04-09 General Electric Company Method of optimizing shim coil current selection in magnetic resonance magnets
US5345178A (en) * 1992-04-21 1994-09-06 Siemens Aktiengesellschaft Method for setting the current through shim coils and gradient coils in a nuclear magnetic resonance apparatus
FR2693802B1 (fr) * 1992-07-17 1994-09-16 Sadis Bruker Spectrospin Procédé de mesure et d'ajustement des gradients d'un appareil à résonance magnétique nucléaire et dispositif correspondant.
US5490509A (en) * 1993-03-18 1996-02-13 The Regents Of The University Of California Method and apparatus for MRI using selectively shaped image volume of homogeneous NMR polarizing field
DE4333440C1 (de) * 1993-09-30 1995-04-06 Siemens Ag Verfahren zur Shimmung eines Magnetfeldes in einem Untersuchungsraum eines Kernspinresonanzgerätes
US5661401A (en) * 1995-03-13 1997-08-26 Jeol Ltd. Apparatus for generating corrective magnetic field
US5617029A (en) * 1995-12-14 1997-04-01 General Electric Company Method of magnet shimming
US6046144A (en) * 1997-06-02 2000-04-04 R.T. Vanderbilt Co., Inc. Combination of phosphate based additives and sulfonate salts for hydraulic fluids and lubricating compositions
US6023167A (en) * 1998-01-26 2000-02-08 Picker International, Inc. Surface coils with integrated shims
US6064208A (en) * 1998-04-02 2000-05-16 Picker International, Inc. Two-peak alignment method of field shimming
JP3878434B2 (ja) * 2001-05-10 2007-02-07 ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー 磁気共鳴撮像用コイル構造体および磁気共鳴撮像装置
DE10147984B4 (de) 2001-09-28 2007-10-11 Siemens Ag Magnetresonanz-Untersuchungsgerät mit einer Einrichtung zur Erzeugung eines homogenen Magnetfeldes und Verfahren zur Verbesserung der Homogenität eines Magnetfeldes
JP4040930B2 (ja) * 2002-08-26 2008-01-30 ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー 磁場均一化方法および装置
US6794868B1 (en) * 2003-06-20 2004-09-21 Varian, Inc. Method of shim optimization
US6995559B2 (en) * 2003-10-30 2006-02-07 Ge Medical Systems Global Technology Company, Llc Method and system for optimized pre-saturation in MR with corrected transmitter frequency of pre-pulses
US7295012B1 (en) * 2006-04-28 2007-11-13 General Electric Company Methods and apparatus for MRI shim elements
DE102007009203B4 (de) * 2007-02-26 2012-03-22 Siemens Ag Verfahren zur Bestimmung oder Anpassung eines Shims zur Homogenisierung eines Magnetfeldes einer Magnetresonanzeinrichtung und zugehörige Magnetresonanzeinrichtung
EP2230530A1 (en) 2009-03-20 2010-09-22 Koninklijke Philips Electronics N.V. A tesseral shim coil for a magnetic resonance system
CN102414572B (zh) * 2009-04-30 2015-02-18 皇家飞利浦电子股份有限公司 用于影响和/或检测磁性颗粒和用于磁共振成像的设备和方法
JP5818267B2 (ja) * 2009-12-02 2015-11-18 ナナリシス コーポレーション 均一な磁場を生み出すための方法および装置
US9778334B2 (en) 2014-05-07 2017-10-03 Scott Technology Nz Limited Magnetic shimming and magnet arrangements
KR101624482B1 (ko) * 2014-10-24 2016-05-26 한국표준과학연구원 원자 자력계 및 그 동작 방법
CN114325520B (zh) * 2020-09-30 2024-07-19 西门子(深圳)磁共振有限公司 磁体升场方法及装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581580A (en) * 1983-12-14 1986-04-08 General Electric Company Intentionally non-orthogonal correction coils for high-homogeneity magnets
JPS60189905A (ja) * 1984-03-09 1985-09-27 Mitsubishi Electric Corp 高均一磁界発生装置
DE3411222A1 (de) * 1984-03-27 1985-10-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Kernspintomograph
US4506247A (en) * 1984-05-23 1985-03-19 General Electric Company Axisymmetric correction coil system for NMR magnets
US4523166A (en) * 1984-10-19 1985-06-11 General Electric Company Optimal field inhomogeneity correction coil operation for NMR magnets

Also Published As

Publication number Publication date
KR870004302A (ko) 1987-05-08
IL80135A0 (en) 1986-12-31
US4680551A (en) 1987-07-14
CA1288806C (en) 1991-09-10
EP0219013A3 (en) 1988-01-07
JPS62123705A (ja) 1987-06-05
JPH0317367B2 (enExample) 1991-03-07
EP0219013A2 (en) 1987-04-22

Similar Documents

Publication Publication Date Title
KR910002654B1 (ko) 정자계 동질화 방법
US4733189A (en) Magnetic resonance imaging systems
US5532597A (en) Passive shimming technique for MRI magnets
US5173661A (en) Nuclear magnetic resonance spectrometer
US5391990A (en) Iterative shimming method for a basic field magnet of a nuclear magnetic resonance tomography apparatus
US5166619A (en) Gradient coil assembly for a magnetic resonance imaging apparatus
Cory et al. NMR images of rotating solids
Redpath et al. A new method of NMR flow imaging
US4456881A (en) Gradient-coil apparatus for a magnetic resonance system
US4646024A (en) Transverse gradient field coils for nuclear magnetic resonance imaging
US5006804A (en) Method of optimizing shim coil current selection in magnetic resonance magnets
US4812797A (en) Compensation coil for temporal drift of a superconducting magnet
US5345178A (en) Method for setting the current through shim coils and gradient coils in a nuclear magnetic resonance apparatus
EP0431848A2 (en) Method of optimizing passive shim placement in magnetic resonance magnets
US5200701A (en) Magnetic resonance imaging apparatus with regulator for reducing eddy current effects
EP0210562A2 (en) Methods for overcoming transient magnetic field inhomogeneity in nuclear magnetic resonance imaging
JPH0222649B2 (enExample)
JPH0763457B2 (ja) 磁気共鳴イメ−ジング装置
US4468622A (en) Gradient coil system for nuclear magnetic resonance apparatus
US5530352A (en) Nuclear magnetic resonance tomography apparatus having dynamically localized shimming of the basic magnetic field
JP6308794B2 (ja) パルス状の補償傾斜磁場を有するｍｒ装置
EP0154996B1 (en) Magnetic resonance imaging apparatus using shim coil correction
Hillenbrand et al. High-order MR shimming: a simulation study of the effectiveness of competing methods, using an established susceptibility model of the human head
US6218839B1 (en) Magnetic resonance imaging systems
US6545476B1 (en) Method for shimming a magnet system of a MR tomography apparatus and MR tomography apparatus for the implementation of the method

Legal Events

Date Code Title Description
PA0109 Patent application

Patent event code: PA01091R01D

Comment text: Patent Application

Patent event date: 19861007

PG1501 Laying open of application
A201 Request for examination
PA0201 Request for examination

Patent event code: PA02012R01D

Patent event date: 19881006

Comment text: Request for Examination of Application

Patent event code: PA02011R01I

Patent event date: 19861007

Comment text: Patent Application

G160 Decision to publish patent application
PG1605 Publication of application before grant of patent

Comment text: Decision on Publication of Application

Patent event code: PG16051S01I

Patent event date: 19910330

E701 Decision to grant or registration of patent right
PE0701 Decision of registration

Patent event code: PE07011S01D

Comment text: Decision to Grant Registration

Patent event date: 19910629

NORF Unpaid initial registration fee
PC1904 Unpaid initial registration fee